Specifications

1-5
Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
78-11380-07
Chapter 1 Overview
Features
• IEEE 802.1Q trunking protocol on all ports for network moves, adds, and changes; management and
control of broadcast and multicast traffic; and network security by establishing VLAN groups for
high-security users and network resources
• VLAN Membership Policy Server (VMPS) for dynamic VLAN membership
• VLAN Trunking Protocol (VTP) pruning for reducing network traffic by restricting flooded traffic
to links destined for stations receiving the traffic
• Dynamic Trunking Protocol (DTP) for negotiating trunking on a link between two devices and for
negotiating the type of trunking encapsulation (802.1Q) to be used
• Voice VLAN for creating subnets for voice traffic from Cisco IP Phones
Security
• Bridge protocol data unit (BPDU) guard for shutting down a Port Fast-configured port when an
invalid configuration occurs
• Protected port option for restricting the forwarding of traffic to designated ports on the same switch
• Password-protected access (read-only and read-write access) to management interfaces (CMS and
CLI) for protection against unauthorized configuration changes
• Port security option for limiting and identifying MAC addresses of the stations allowed to access
the port
• Port security aging to set the aging time for secure addresses on a port
• Multilevel security for a choice of security level, notification, and resulting actions
• MAC-based port-level security for restricting the use of a switch port to a specific group of source
addresses and preventing switch access from unauthorized stations (available only with the EI)
• Terminal Access Controller Access Control System Plus (TACACS+), a proprietary feature for
managing network security through a TACACS server
• IEEE 802.1X port-based authentication to prevent unauthorized devices from gaining access to the
network
• IEEE 802.1X port-based authentication with VLAN assignment for restricting
802.1X-authenticated users to a specified VLAN (available only with the EI)
• IEEE 802.1X port-based authentication with port security for authenticating the port and managing
network access for all MAC addresses, including that of the client (available only with the EI)
• IEEE 802.1X port-based authentication with port security for controlling access to 802.1X
multiple-host ports
• IEEE 802.1X port-based authentication with voice VLAN to permit an IP phone access to the voice
VLAN irrespective of the authorized or unauthorized state of the port
• Standard and extended IP access control lists (ACLs) for defining security policies (available only
with the EI)